Investigation on decomposition mechanism of tantalum ethylate precursor during formation of TaC on C/C composite material
Investigation on decomposition mechanism of tantalum ethylate precursor during formation of TaC on C/C composite material
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DOI：
10.1016/j.matlet.2006.03.023
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发表时间：
2006-12
影响因子：
3
通讯作者：
Hanwei He;K. Zhou;X. Xiong;Bai-yun Huang
中科院分区：
文献类型：
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作者：
Hanwei He;K. Zhou;X. Xiong;Bai-yun Huang
制备了无定形的乙酸钽作为制备TaC的前驱体。用红外光谱和X射线衍射仪对乙酸钽薄膜进行了表征。用X射线衍射仪确定了TG-DTA测试过程中中间产物的物相组成。研究了乙酸钽前驱体在C/C复合材料上生成TaC时的分解机理。结果表明，在TaC的形成过程中，在35~500℃的温度范围内分解，在500℃以下首先生成TaO，然后在500℃以上转化为Ta2O5。在C/C复合材料中，Ta2O5被足够的C还原，最终生成TaC。
The amorphous tantalum ethylate as the precursor for preparation of TaC is prepared. Tantalum ethylate film is characterized by FT–IR spectra and XRD. The phase constitutions of the intermediate products during TG–DTA measurement are defined by XRD. The decomposition mechanism of tantalum ethylate precursor during formation of TaC on C/C composite material is investigated. The results indicate that, in the course of formation of TaC, when the tantalum ethylate precursor is decomposed at temperature from about 35 to 500 °C, TaO is first produced below 500 °C, then TaO is transformed into Ta2O5above 500 °C. Throughout the decomposition process of the tantalum ethylate precursor, there are no tantalum carbonides formed. Ta2O5is deoxidized by the sufficient C in the C/C composite materials and TaC is formed finally.